Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

On Sat, Dec 08, 2018 at 07:38:38PM -, Christophe R. Patraldo wrote:
> This still isn't working right, at least not for me. I'm trying to
> upgrade the release from 16.04 to 18.04 installed on Google Compute
> Engine. Is it a different bug or am I missing something?

The fixed version of screen is in the -updates pocket for Ubuntu 18.04.
Do you have -updates enabled for Ubuntu 16.04?

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Christophe R. Patraldo]

This still isn't working right, at least not for me. I'm trying to
upgrade the release from 16.04 to 18.04 installed on Google Compute
Engine. Is it a different bug or am I missing something?

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Christophe R. Patraldo]

$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,263 kB]   
Fetched 1,264 kB in 0s (0 B/s)  
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'
Directory '/var/run/screen' must have mode 777.

$ screen
Directory '/var/run/screen' must have mode 777.

$ ls -lat /run/screen
total 0
drwxr-xr-x 29 root root 1260 Dec  8 01:42 ..
drwxrwxr-x  2 root utmp   40 Dec  6 20:36 .

$ sudo service screen-cleanup status
● screen-cleanup.service
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)

$ ls -lh /lib/systemd/system/screen-cleanup
ls: cannot access '/lib/systemd/system/screen-cleanup': No such file 
or directory

$ cat /etc/tmpfiles.d/screen-cleanup.conf
cat: /etc/tmpfiles.d/screen-cleanup.conf: No such file or directory

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Thanks to Brian for his patience with the remote debugging session via
Launchpad comments. And for the resulting HOWTO for reproducing the
issue. :-)

Given that Stretch's screen package is without libutempter, too, this
might bite Debian with Stretch to Buster upgrades inside screen, too.
I'm though surprised that I didn't get any bug reports about this in
Debian yet. Will check.

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Mark Shuttleworth]

\o/ thanks all, glad that one got in for the point release.

Mark

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Launchpad Bug Tracker]

This bug was fixed in the package screen - 4.6.2-1ubuntu1

---
screen (4.6.2-1ubuntu1) bionic; urgency=medium

  * debian/screen.preinst: When screen is unpacked but not configured the
permissions for /var/run/screen need to be changed so that an existing
screen session can be reconnected to e.g. during an distribution upgrade.
(LP: #1761997)

 -- Brian Murray   Fri, 20 Jul 2018 06:57:59 -0700

** Changed in: screen (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

I went ahead and verified this by ssh'ing to an Ubuntu 16.04, starting
the upgrade after having modified /etc/cron.daily/mlocate and changing
DistUpgradeController.py so -proposed would not be disabled. During the
upgrade process screen was unpacked, then I received the mlocate conf
file prompt before screen was set up (configured). When I received the
mlocate conf file prompt I was to disconnect and reconnect from the
screen session.

Attached is the /var/log/dist-upgrade/apt-term.log from the system being
upgraded.

** Attachment added: "apt-term.log"
   
https://bugs.launchpad.net/ubuntu/+source/screen/+bug/1761997/+attachment/5165615/+files/apt-term.log

** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Łukasz Zemczak]

Hello Mark, or anyone else affected,

Accepted screen into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/screen/4.6.2-1ubuntu1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: screen (Ubuntu Bionic)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

** Changed in: screen (Ubuntu)
 Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: screen (Ubuntu)
   Status: Triaged => In Progress

** Also affects: screen (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Also affects: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Status: New => Invalid

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
   Status: New => Invalid

** Changed in: screen (Ubuntu Bionic)
   Status: New => In Progress

** Changed in: screen (Ubuntu)
   Status: In Progress => Invalid

** Changed in: screen (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: screen (Ubuntu Bionic)
 Assignee: (unassigned) => Brian Murray (brian-murray)

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

Axel (sorry about that),

I was confused about what order (installing the new binary vs running
the preinst) things happened in. Checking the perms for 2755 in the
preinst does work.

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Hi Brian,

Brian Murray wrote:
> Alex - I don't think that will work because when the new version of
> screen is unpacked the permissions are 755, so the check would need to
> be for 755, not 2755.

No. I said into _pre_inst, not postinst, so that everything is in
place and fixed when screen has been unpacked, but not configured.

Or did I understand your previous mail about screen in 16.04 being
2755?

Regards, Axel (not Alex)
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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

Alex - I don't think that will work because when the new version of
screen is unpacked the permissions are 755, so the check would need to
be for 755, not 2755.

(xenial-amd64)root@impulse:/mnt/sec-machines# dpkg --unpack 
screen_4.6.2-1_amd64.deb
(Reading database ... 23570 files and directories currently installed.)
Preparing to unpack screen_4.6.2-1_amd64.deb ...
Unpacking screen (4.6.2-1) over (4.3.1-2build1) ...
Processing triggers for systemd (229-4ubuntu21.2) ...
Processing triggers for man-db (2.7.5-1) ...
(xenial-amd64)root@impulse:/mnt/sec-machines# stat -c%a /usr/bin/screen
755

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Hi,

Brian Murray wrote:
> Ah I think it (the tmpfile isn't created) because /usr/bin/screen is
> 2755 in Ubuntu 16.04 but 755 in Ubuntu 18.04. Here's the change between
> the two releases.

Ah! That's due to switching to use libutempter. We're getting quite
close to the issue.

I though wonder how to fix that for Bionic in the best way. Maybe
adding something like this to screen.preinst (not postinst):

perms="`stat -c%a /usr/bin/screen`"
override=/etc/tmpfiles.d/screen-cleanup.conf
if [ $perms -eq 2755 ]; then
chmod 0777 /var/run/screen
[ -f $override ] || echo 'd /var/run/screen 0777 root utmp' > $override

I assume that this is nothing which would make sense to add to future
releases of Debian's screen package, or does it?

Regards, Axel
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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

Ah I think it (the tmpfile isn't created) because /usr/bin/screen is
2755 in Ubuntu 16.04 but 755 in Ubuntu 18.04. Here's the change between
the two releases.

 override_dh_auto_install:
-   # can't call the normal install target b/c it installs the info files
-   # and other crud
-   $(MAKE) prefix=$(ROOT)/usr 
SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
-   # hack around the fact that the install target makes screen a symlink 
to screen-$$(VERSION)
-   rm -f $(ROOT)/usr/bin/screen
-   mv -f $(ROOT)/usr/bin/screen* $(ROOT)/usr/bin/screen
-   # make it setgid utmp
-   chown root:utmp $(ROOT)/usr/bin/screen
-   chmod 2755 $(ROOT)/usr/bin/screen
+   # can't call the normal install target b/c it installs the
+   # info files and other crud
+   cd build;  $(MAKE) prefix=$(ROOT)/usr  
SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
+   cd build-udeb; $(MAKE) prefix=$(ROOT_UDEB)/usr 
SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
+   # hack around the fact that the install target makes screen a
+   # symlink to screen-$$(VERSION)
+   rm -f  $(ROOT)/usr/bin/screen  $(ROOT_UDEB)/usr/bin/screen
+   mv -f  $(ROOT)/usr/bin/screen*  $(ROOT)/usr/bin/screen
+   mv -f $(ROOT_UDEB)/usr/bin/screen* $(ROOT_UDEB)/usr/bin/screen
+   # make it setgid utmp only in udeb
+   chown root:utmp $(ROOT_UDEB)/usr/bin/screen
+   chmod 2755  $(ROOT_UDEB)/usr/bin/screen
+   chmod  755  $(ROOT)/usr/bin/screen

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

/etc/tmpfiles.d/screen-cleanup.conf does not exist on an Ubuntu 16.04
install nor is it created when I install screen on a Ubuntu 16.04
system.

 $ schroot -u root -c xenial-amd64
(xenial-amd64)root@impulse:/mnt/sec-machines# apt-get install screen
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  iselect | screenie | byobu ncurses-term
The following NEW packages will be installed:
  screen
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 560 kB of archives.
After this operation, 972 kB of additional disk space will be used.
Get:1 http://192.168.10.7/ubuntu xenial/main amd64 screen amd64 4.3.1-2build1 
[560 kB]
Fetched 560 kB in 0s (2131 kB/s)
Selecting previously unselected package screen.
(Reading database ... 23511 files and directories currently installed.)
Preparing to unpack .../screen_4.3.1-2build1_amd64.deb ...
Unpacking screen (4.3.1-2build1) ...
Processing triggers for systemd (229-4ubuntu21.2) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up screen (4.3.1-2build1) ...
Processing triggers for systemd (229-4ubuntu21.2) ...
(xenial-amd64)root@impulse:/mnt/sec-machines# ls -lh /etc/tmpfiles.d/
total 0

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Hi Brian,

Brian Murray wrote:
> /run/screen has the following permissions
> 
> drwxrwxr-x  3 root  utmp60 Jul 19 06:06 screen

Thanks. This is indeed not the expected setting.

> screen-cleanup is a masked service in response to bug 1462692, so the
> permissions of /run/screen are never changed in Ubuntu 16.04.

Hrm, but 4.3.1-2build1 in 16.04 should also already have generated
/etc/tmpfiles.d/screen-cleanup.conf during postinst. (That was fixed
in the same upload as #1462692.)

And 16.04 already had systemd as default if not only init system.

> bdmurray@clean-xenial-amd64:~$ sudo service screen-cleanup status
> [sudo] password for bdmurray: 
> ● screen-cleanup.service
>Loaded: masked (/dev/null; bad)
>Active: inactive (dead)
> bdmurray@clean-xenial-amd64:~$ ls -lh 
> /lib/systemd/system/screen-cleanup.service
> lrwxrwxrwx 1 root root 9 Oct  4  2016 
> /lib/systemd/system/screen-cleanup.service -> /dev/null

Please also check the existence and contents of
/etc/tmpfiles.d/screen-cleanup.conf before and after upgrading.

Regards, Axel
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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

/run/screen has the following permissions

drwxrwxr-x  3 root  utmp60 Jul 19 06:06 screen

screen-cleanup is a masked service in response to bug 1462692, so the
permissions of /run/screen are never changed in Ubuntu 16.04.

bdmurray@clean-xenial-amd64:~$ sudo service screen-cleanup status
[sudo] password for bdmurray: 
● screen-cleanup.service
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)
bdmurray@clean-xenial-amd64:~$ ls -lh /lib/systemd/system/screen-cleanup.service
lrwxrwxrwx 1 root root 9 Oct  4  2016 
/lib/systemd/system/screen-cleanup.service -> /dev/null

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Hi Brian,

Brian Murray wrote:
> + 2) rm /etc/cron.daily/mlocate (this'll ensure you get a conffile prompt)
> + 3) ssh to Ubuntu 16.04 system so the release upgrade is run in screen
> + 4) run do-release-upgrade -d
> + 5) wait for the conffile prompt from mlocate
> + 6) ssh to the Ubuntu 16.04 system being upgraded
> + 7) sudo -i
> + 8) run screen -rd
> + 
> + With the version of screen in the release pocket you'll receive the
> + following error:
> + 
> + root@clean-xenial-amd64:~# screen -rd
> + Directory '/run/screen' must have mode 777.

Thanks for the detailed explanations.

This sounds a little bit like screen being already unpacked, but not
yet configured. But there must be more than that…

Can you check what permissions /run/screen actually has at that point?

What I don't understand is: Since screen is already running at that
point, /run/screen should already exist with the proper permissions
from either /etc/tmpfiles.d/screen-cleanup.conf or from
/etc/init.d/screen-cleanup from 16.04's screen package. And according
to the changelog (in Debian at least), nothing in the maintainer
scripts changed between 4.3.1-2 and 4.6.2-1. And git log shows only
two commits since June 2015 (where /etc/tmpfiles.d/ support was
finalized), of which one just renames the files and the other one
replaces /var/run/ with /run/ — which both should be defacto noop with
regards to their logic.

Does any other package modify /run/'s permissions recursively during
dist-upgrade?

Regards, Axel
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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

One could also follow these simple steps to recreate the bug.

1) Start screen on Ubuntu 16.04
2) Download bionic's screen
3) Run 'sudo dpkg --unpack screen_4.6.2-1_amd64.deb'
4) try to reattach to screen

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

** Description changed:

- I saw some odd behaviour of screen during the upgrade from Xenial to
- Bionic using do-release-upgrade. I was trying to use screen to reattach
- to an upgrade process that had gone sideways during a router daemon
- upgrade (duh). But I was told that the permissions on /run/screen needed
- to be 777. Does the bionic version of screen have that as a requirement?
- And if so, perhaps do-release-upgrade should set those permissions in
- anticipation of the upgrade process so that screen works with both old
- and new versions.
+ [Test Case]
+ 1) have an Ubuntu 16.04
+ 2) rm /etc/cron.daily/mlocate (this'll ensure you get a conffile prompt)
+ 3) ssh to Ubuntu 16.04 system so the release upgrade is run in screen
+ 4) run do-release-upgrade -d
+ 5) wait for the conffile prompt from mlocate
+ 6) ssh to the Ubuntu 16.04 system being upgraded
+ 7) sudo -i
+ 8) run screen -rd
+ 
+ With the version of screen in the release pocket you'll receive the
+ following error:
+ 
+ root@clean-xenial-amd64:~# screen -rd
+ Directory '/run/screen' must have mode 777.
+ 
+ [Original Description]
+ I saw some odd behaviour of screen during the upgrade from Xenial to Bionic 
using do-release-upgrade. I was trying to use screen to reattach to an upgrade 
process that had gone sideways during a router daemon upgrade (duh). But I was 
told that the permissions on /run/screen needed to be 777. Does the bionic 
version of screen have that as a requirement? And if so, perhaps 
do-release-upgrade should set those permissions in anticipation of the upgrade 
process so that screen works with both old and new versions.

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Francis Ginther]

** Tags added: id-5b05e6a18adf2325732c69ca

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Francis Ginther]

** Tags added: id-5ad8bd0d1f6a45cc0c62874b

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Dimitri John Ledkov]

** Changed in: ubuntu-release-upgrader (Ubuntu)
Milestone: None => ubuntu-18.04.1

** Changed in: screen (Ubuntu)
Milestone: None => ubuntu-18.04.1

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

** Also affects: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided
   Status: New

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  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

** Changed in: screen (Ubuntu)
   Status: Invalid => Triaged

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Title:
  /var/run needs mode 777 in bionic

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Re: [Bug 1761997] Re: /var/run needs mode 777 in bionic

[Steve Langasek]

On Wed, Apr 11, 2018 at 10:21:20AM -, Axel Beckert wrote:
> Steve Langasek wrote:
> > I believe this is a bug in screen.  The postinst script has code to
> > handle the changed requirements for /run/screen permissions, but then
> > immediately afterwards a debhelper code snippet runs which clobbers them
> > again.

> I currently don't see that clobbering, at least not in Debian:

> The maintainer-written code creates
> /etc/tmpfiles.d/screen-cleanup.conf in most cases.

> It also links /lib/systemd/system/screen-cleanup.service to /dev/null.

> debhelper-generated code seems to create
> /usr/lib/tmpfiles.d/screen-cleanup.conf — which is overridden by
> /etc/tmpfiles.d/screen-cleanup.conf if it exists.

Brian has also not been able to reproduce this behavior, and I haven't
reproduced it by installing the package, only by directly running the
command from the postinst which I believe would be run as part of the
upgrade.

I do have /etc/tmpfiles.d/screen-cleanup.conf and it is correct.  My
permissions for /run/screen on boot are correct.  But when I ran that
command, /etc/tmpfiles.d/screen-cleanup.conf seemed to have been ignored.

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Brian Murray]

I've been able to recreate this during a distribution upgrade from 16.04
to 18.04 (directory permissions switched from 775 to 777) when the
package is unpacked but not yet configured. This could end up causing an
issue at a conffile prompt for a different package if your screen
session (which the release upgrader runs under) was disconnected.

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Title:
  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Steve Langasek wrote:
> I believe this is a bug in screen.  The postinst script has code to
> handle the changed requirements for /run/screen permissions, but then
> immediately afterwards a debhelper code snippet runs which clobbers them
> again.

I currently don't see that clobbering, at least not in Debian:

The maintainer-written code creates
/etc/tmpfiles.d/screen-cleanup.conf in most cases.

It also links /lib/systemd/system/screen-cleanup.service to /dev/null.

debhelper-generated code seems to create
/usr/lib/tmpfiles.d/screen-cleanup.conf — which is overridden by
/etc/tmpfiles.d/screen-cleanup.conf if it exists.

If it is not created because neither of the two conditions in the
maintainer code is given, I don't see how something which is not
created can be clobbered.

So please elaborate where you see the bug in screen's postinst.
Setting to "invalid" until then. Feel free to reassign or -- if you
can explain where the bug is -- reopen.

(Note: To me this rather looks like a not yet run postinst or similar
during a dist-upgrade.)

Regards, Axel
-- 
 ,''`.  |  Axel Beckert , https://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
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  `-|  1024D: F067 EA27 26B9 C3FC 1486  202E C09E 1D89 9593 0EDE


** Changed in: screen (Ubuntu)
   Status: Triaged => Invalid

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  /var/run needs mode 777 in bionic

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[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Steve Langasek]

I believe this is a bug in screen.  The postinst script has code to
handle the changed requirements for /run/screen permissions, but then
immediately afterwards a debhelper code snippet runs which clobbers them
again.

** Package changed: ubuntu-release-upgrader (Ubuntu) => screen (Ubuntu)

** Changed in: screen (Ubuntu)
   Importance: Undecided => High

** Changed in: screen (Ubuntu)
   Status: New => Triaged

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